Lifting-jack.



No. 780,132. PATENTED JAN. 17, 1905. A. SGHATZ.

LIFTING JACK.

APPLICATION FILED APR. 30, 1904.

2 SHEETS-$153135! 1..

A TTOFNEYS,

No. 780,132. PATENTED JAN. 1'7, 1905. A. SOHATZ. LIFTING JACK.

APPLICATION FILED APILGO, 1904i 2 SHEETS-SEEBT a.

A TTOHNEYS,

WITNESSES:

ITE STATES Patented January 1'7, 1905 PATENT OEEIoE.

ADOLF SCHATZ, OF NEW HAVEN, CONNECTICUT, ASSIC-NOR TO ACME BALL BEARINGCOMPANY, OF Cl-IAIPAQUA, NEW YORK, A CORPORA- LIIFTING UACK.

SPECIFICATION forming part of Letters Patent No. 780,132, dated January17, 1905.

Application filed April 30, 1904. Serial No. 205,756.

To all whom it may concern:

Be it known that I, ADOLF SoHA'rz, of the Figure 1 represents a top viewof a liftingjack embodying my invention, the cover being moved and ahorizontal section taken on the plane of the cover through thelifting-screw.

Fi of of g. 2 represents a vertical section on line 2 2 Fig. 1; Fig. 3,a vertical section on line 3 3 Fi 1, and Fig. 4a detail view of thefriction-plate and spring.

In all figures similar letters of reference represent like parts.

This invention relates to lifting-jacks, and

has for its object the production of a new and eflicient jack having theseveral improvements and combinations of parts pointed out and claimedhereinafter.

In lifting-jacks operated by hand, wherein the reverse direction,thereby destroying the utility of the jack.

This invention has for its object the produc tion of a jack which isprovided with a novel friction device adapted to hold the wormgear frombeing turned by pressure on the liftingscrew, which friction device isshown more particularly as consisting in an idler-gear meshing with agear on the worm or main crank-shaft of the jack.

Referring to the drawings for a more par ticular description, the partsdesignated by th th ce C e letter A represent the body or casing of ejack, which is provided with a hollow ress B, from which depends ahollow socket In the recess I3 around the mouth of the socket C is anannular groove D for the reception of a series of balls orroller-bearings E. Mounted on the balls E is a worm-wheel F, which formsthe nut for the lifting-screw Gr. The worm-wheel F is provided withintegral screw-threading for the purpose of meshing with the thread ofthe lifting-screw G. On the outer edge of the worm-wheel F is a threadadapted to mesh with the thread on an endless screw or worm II, alsolying in the recess B and having bearings in the casingA. 60 This worm His rigidly mounted on or formed integral with a shaft I, extendingoutward through the side of the casing and having mounted on its outerend a crank-arm K of well-known construction. On the shaft I between thecrank-arm K and worm H is rigidly mounted a gear L, which meshes with anidle gear M. The gear M is mounted on a post N and is provided with aplate 0, adapted to bear against the side of fiber plate N, which inturn bears against the gear M. On the other side of the gear M isanother iiber plate, Z, resting against the casing A, so that the gear Mwill act as a friction device in retarding the movement of the gear. Theplate O is held in place by a spring-plate X, forced against the plateby the cap 1, adapted to lit over the portion of the ease or body of thejack in which the gear M is located and which may be screwed downagainst the easing by means of screws Q. Over the body of the hollowrecess B a cover-plate It is adapted to lit, through which extends theupper end of the lifting-screw (if, the lower end of which. may projectdownward into the socket C. This cover-plate It may be provided with ahandle S for carrying the jack about.

T is a shoe secured by means of a screw V or other suitable means in therecess B between the side of the casing and the worm H to bear on theworm II, thus preventing it from being forced out of mesh with theworm-wheel F.

The operation of the device is as follows: Upon proper movement of thecrank-arm K the worm H is rotated and in turn rotates in a horizontalplane the worm-wheel F. The

worm-wheel F, meshing with the lifting-screw G, forces the screw upwardor downward, acl for pressing said fiber plates against saididlercording to the direction in which the wheel is gear to retard itsmovement, substantially as turned. hen a heavy weight is carried by theouter end of the lifting-screw G, the screw will be prevented from beingforced downward by the worm-wheel F and worm H, because the shaft I ofthe worm H is frictionally held from rotation by the gear L meshing withthe idler M. The gear L beingnear the crank-arm K, where the power ofthe operator is applied, a much less amount of power applied at thecrank-arm will overcome the friction of the idler M than when applied atthe end of the lifting-screw G.

Having now described my invention,(which may vary somewhat withoutdeparting from the spirit thereof,) what I claim, and desire to secureby Letters Patent, is

1. In a lifting-jack, the combination with a vertically-disposedlifting-screw; of a horizontally-disposed crank-shaft carrying a worm; aworm-wheel for transmitting the rotary movement of said crank-shaft tosaid screw; and an idler friction-gear adapted to engage a gear on saidcrank-shaft to retard the rotation of said crank-shaft, substantially asdescribed.

2. In a lifting-jack, the combination witha vertically-disposedlifting-screw; of ahorizontally-disposed crank-shaft carrying a worm; aworm wheel for transmitting the rotary movement of said crank-shaft tosaid screw; a gear on said crank-shaft; an idler-gear adapted to meshwith said gear; and yielding friction-plates adapted to retard themovement of said idler-gear, substantially as described.

33. In a lifting-jack, the combination with a vertically-disposedlifting-screw; of a horizontally-disposed crank-shaft carrying a worm; aWorm-wheel for transmitting the rotary movement of said crank-shaft tosaid screw; a gear on said crank-shaft; an idler-gear adapted to meshwith said gear; and a friction plate spring pressed against saidic'ller-gear to retard its movement, substantially as described 4. In alifting-jack, the combination with a vertically-disposed lifting-screw;of a horizontally-disposed crank-shaft carrying a worm; a worm-wheel fortransmitting the rotary movement of said crank-shaft to said screw; agear on said cran k-sh aft; an idler-gear adapted to mesh with saidgear; fiber plates bearing on both sides of said idler-gear, and meansdescribed.

5. In a lifting-jack, the combination with a vertically-disposedlifting-screw; of a horizontally-disposed crank-shaft carrying a worm; aworm-wheel meshing with said worm and transmitting the rotary movementof said shaft to said screw, and a shoe bearing on said worm to hold itconstantly in engagement with said wheel, substantially as described.

6. In a lifting-jack, the combination with a vertically-disposedlifting-screw; of a horizontally-disposed crank-shaft carrying a worm: aworm-wheel for transmitting the rotary movement of said crank-shaft tosaid screw; and a device constantly in engagement with said crank-shaftto retard the movement of said shaft, substantially as described.

7. In a lifting-jack, the combination with a vertically-disposedlifting-screw; of a horizontally-disposed crank-shaft carrying a worm; aworm-wheel for transmitting the rotary movement of said crank-shaft tosaid screw; and a device constantly engaging said crankshaft at a pointbetween said worm and the place Where the power is applied to retard themovement of said shaft, substantially as described.

8. In a lifting-jack, the combination with a vertically-disposedlifting-screw; of ahorizontally-disposed worm; a crank-shaft foroperating said worm; a worm-wheel for transmitting the rotary movementof said worm to said screw; a friction device for retarding the movementof said crank-shaft; and means for constantly retaining the connectionbetween said friction device and crank-shaft, substantially asdescribed.

9. In a lifting-jack, the combination with a vertically-disposedlifting-screw; of a horizontally-disposed worm; a crank-shaft operatingsaid worm; a worm-wheel for transmitting the rotary movement of saidworm to said screw; a friction device for retarding the movement of saidcrank-shaft; and a gearing for effecting the connection between thefriction device and crank-shaft, substantially as descrbed.

In witness whereof I have hereunto set my hand on the 27th day of April,

ADOLF SCHATZ.

I/Vitnesses:

H. A. SoHA'rz, E. B. EUERLE.

